Production of zinc oxid from zinc ores and zinc residues.



1,002,401 PRODUCTION OF ZINC ()XID FROM ZINC ORES AND ZINC RliSlDtll'lS. \Vonomr/ta I-loanmn, London, England, assignor to Metals Extraction Cor aeration, Limited, London, Eng-- land. I'iled Nov. 30, 1908, Serial No.

To all whom it may concern:

Be it known thatI, \YonommnI-Ioanmn, a citizen of the-Swiss Republic, rosiding at '1 London, in l'ingland, have invented certain new and useful Improvements in the Production of Zinc Oxid from Zinc Ores and Zinc Residues, of which the following is a;

specification.

This invention relates to improvements In the extraction of zinc from ores and zinc 1 residues.

In the previous patent application of llonnnel and Sulman Serial ho. 401513 s described a process in which roasted ore. is mixed with coal and placed in a furnace or I t I blowing hearth containing burning fueh whereupon air is blown through the heated I mass so as to volatilize the zinc (.whieh immediately lmrns to form zinc oxid) in admixture with other metallic matters and this mixture is subsequently treated for the extraction of the zinc therefrom. The presrowns" wowll sary before blowing oh the zinc from zinc p ore, to mix the roasted ore with carbonaceous matter.

According to tlus invention a process for it extracting zinc from zinc ore and zinc residues containing carbonaceous matter cousists in mixing the (preferably roasted) ore with the residues, igniting the mixture in a l furnace or blowinlg hearth. blowing oil the zinc contents (w rich burn to form zinc l oxid) together with other metallic matters. collecting the product thus volatilizcd, treating ,it with a solution of sulfnrous i acid so as to obtain a solution of bisulfite of zinc and precipitating the zinc as insoluble monosultite which is then calcined to produce zinc oxid.

The following is a description by way of example of one method of carrying the invention into etl'eet:--A zinc ore which may i for example be a complex ore is first roastt ed in the usual manner with or without cut invention is a modification in detail of; that process. In the neighborhood of most mcl and Sulman referred to above it is neces-- fluxes. The roasted ore is then mixed with he matter and also a notable proportionpf coke or carbon. The proportion in which etlect the reduction of all the zinc in the -1nixture, or additional solid or gaseous fuel may be used. into a furnace or blowing hearth containing burning fuel and when the mixture. is ignited. air or other suitable gas is blown through the mass so as to blow oil the zinc in admixture with other metallic matter. ,The zinc immediately burns to f rm zinc oxid which is condensed and collected. The \olntili'laul portion is then treated with a solution of sulturous acid. and a. solution of insoluble zine Iuonosnllite is precipitated and calcined to produce. zinc oxid.

it is to be understood that. the details of jthe process may be varied without depart-- ,iug from this invention.

What I claim as my invention and desire to secure by Letters Patent is:-

l. 'lhe herein described process for recovering zine from waste zinc furnace distillation residues containing carbonmieous matter.and simultaneously extracting zinc from fresh zinc ore. which consists in mixing the treating it with a solution of sulfurous acid so as to obtain a solution of bisttltite of zinc and precipitating the ziueas insoluble 1uonosultite which is then calcined to produce zinc oxid.

9. The herein described process for retiliation residues containing earlmnaceous matter. and simultaneously extracting zinc from fresh zinc ore, which consists in roasting the ore, mixing it with the residues. igniting the mixture. blowing oil the zinc contents together with other metallic matters. collecting' the product thus volatilized. treating it with a solution of sulfurous acid so as to obtain a solution of bisultitc. of zinc and precipitating the zinc as insoluble monosultite which is then calcined to produce zinc oxid.

3. The herein described process for recovering zinc from waste zinc furnace distillation residues containing carbonaceous matter. and simultaneously extracting zinc from fresh zinc ore, which consists in roast.- mg the ore, nnxiug itwith the zinc residues containing sutlleicut carbon to etl'ect the reduction of all the zinc in the mixture, igniting the mixture. so as to blow oil the zine. (which burns to form zine oxid) in zinc furnace distillation residues containing say metalllc zine, metallic iron. zinc sthcatc, zinc exid, zinc sultid, and other metal-' the two ingredients are mixed is such than the quantity of carbon shall be sutlicient to 'lho mixture is introduced pure bisultite of zine obtained from which i ore. with the residues. blowing oh the zinc j contents together with other metallic matters. collecting the product thus volatilized, 1

covering zine from waste zinc furnace dismlmixLura with other melallic matter, coilccfiug the product thus vnlai ilizecl. treating it with a solution of snifnrous acid so as to obtain-a solution of bisnlfite of zinc and precipitating the zinc as insoluble monosui- =filalwhich is then calcined to produce zinc OXK I In testimony whcrgqf I'havo signed my I name In this specification in the presence of two suhscrihin v witnesses. iVOLDEMAR HOMMEL.

i Witnesses: i PERCY W. II. Umnmsmz, J I". B. Bugs. 

